49Rob, Gee!!! I don't think it's fair to dismiss a material like OSB from the get go
GP,
Sorry if I came off too strong...but many years of experience with OSB has proven to me that while it is a good product for specific uses, it simply is not designed for, nor can be expected to last in exterior applications.
There are 4 general grades of OSB.
The type of glue used determines its moisture resistance.
Bob,
Sorry, not a personal attack, just my opinion based on experience.
GP and Bob,
ANY building material; OSB, Masonite, cardboard, even paper can be used in exterior applications.
The key is keeping them encapsulated (able to resist all moisture).
Bob's trailer may last 50 years; it all depends on how careful he is about making sure no moisture gets into the OSB.
I suggested not even considering using OSB to the new member because while it can withstand the elements if properly protected, if it gets wet a few times, or is subjected to an unknown leak, it will disintegrate before the issue becomes known, and will leave the trailer owner with a mess that requires complete disassembly of the trailer to replace.
A few extra dollars spent now, on plywood, will buy him a couple extra chances.
That is, plywood can take several wettings before delaminating/becoming ruined.
Simple logic says that using a very iffy material as a foundation on which to build your dream trailer is not wise.
If someone like Bob understands what he is doing, and is willing to take the risk that he will catch the leak before it causes damage, that’s great!
He saved a few bucks and all is well.
To many do it yourselfers, plywood and OSB are the same thing, sheet goods.
I'm simply pointing out that while they are both made of wood, and come in 4x8 sheets, they are not the same.
I know about wood and am trying to help a new person, the same as I would hope a doctor, or other professional would call to my attention, my lack of understanding in their field of knowledge.
Rob
Waiting for "someday" will leave you on your deathbed wondering why you didn't just rearrange your priorities and enjoy the time you had, instead of waiting for a "better" time to come along...
